A stone is dropped from rest and falls freely for 3 seconds. Taking g as 10 m per second squared, the distance fallen is
Correct answer: C. 45 m
- A. 15 m
- B. 30 m
- C. 45 m
- D. 90 m
Explanation
Using s equals half g t squared, the distance is half multiplied by 10 multiplied by 9, giving 45 m. The value 30 m is the velocity after 3 seconds in metres per second, offered as a distractor. Distance in free fall grows with the square of the time, not in proportion to it.
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About Acceleration
Acceleration measures the rate at which velocity changes with time, including changes in speed, direction or both. Work includes average and instantaneous acceleration, the relation a = Δv/Δt, uniform acceleration equations, and interpreting velocity time and displacement time graphs, with acceleration carefully distinguished from velocity.
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